<!DOCTYPE html>
<html lang="en">

	<head>
		<meta charset="UTF-8">
		<meta name="viewport" content="width=device-width, initial-scale=1.0">
		<meta http-equiv="X-UA-Compatible" content="ie=edge">
		<title>Document</title>
		<style>
			.sliderbar {
				position: fixed;
				right: 0;
				bottom: 100px;
				width: 40px;
				height: 40px;
				text-align: center;
				line-height: 40px;
				cursor: pointer;
				color: #fff;
			}

			.con {
				position: absolute;
				left: 0;
				top: 0;
				width: 200px;
				height: 40px;
				background-color: purple;
				z-index: -1;
			}
		</style>
		<script type="text/javascript" src="js/animate.js">

		</script>
	</head>

	<body>
		<div class="sliderbar">
			<span>←</span>
			<div class="con">问题反馈</div>
		</div>

		<script>
			// 1. 获取元素
			var silderbar = document.querySelector('.sliderbar');
			var con = document.querySelector('.con');

			// 当我们鼠标经过 sliderbar 就会让 con这个盒子滑动到左侧
			// 当我们鼠标离开 sliderbar 就会让 con这个盒子滑动到右侧

			silderbar.addEventListener('mouseenter', function() {
				animate(con, -160, function() {
					silderbar.children[0].innerHTML = "→";
				})
			});
			silderbar.addEventListener('mouseleave', function() {
				animate(con, 0, function() {
					silderbar.children[0].innerHTML = "←";
				})
			});
		</script>
	</body>

</html>
